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18.
EEPROM (Electrically erasable programmable read – only memory) is a special type of PROM that can be erased by exposing it to an electrical charge. </li></ul>

19.
IV – The CPU <ul><li>The CPU is the abbreviation for Central Processing Unit. The CPU is the brains of the computer. In terms of computing power the CPU is the most important element of a computer system.

20.
On large machines, CPU's require one or more printed circuit boards. On personal computers and small workstations, the CPU is housed in single chip called a microprocessor.

21.
The CPU itself is an internal component of the computer. </li></ul>

22.
<ul><li>The CPU is inserted directly into a CPU socket, pin side down, on the motherboard.

23.
Two typical components of a CPU are the following: </li><ul><li>The arithmetic logic unit ( ALU ), which performs arithmetic and logical operations.

24.
The control unit ( CU ), which extracts instructions from memory and decodes and executes them, calling on the ALU when necessary. </li></ul></ul>

25.
<ul><li>In conclusion the computer is an easy to use tool which has a more or less important memory capacity according to computers.

26.
The computer has material components like the printer as well as non material components like Windows software.

27.
The computer evolves more and more with wireless keyboard, mousse, touch screen. </li></ul>V - Conclusion